rust/tests/ui/impl-trait/issues/issue-84073.stderr

error[E0599]: the method `when` exists for struct `RaceBuilder<_, Never<_>>`, but its trait bounds were not satisfied
  --> $DIR/issue-84073.rs:32:27
   |
LL | pub struct Never<T>(PhantomData<T>);
   | ------------------- doesn't satisfy `Never<_>: StatefulFuture<Option<_>>`
...
LL | pub struct RaceBuilder<F, S> {
   | ---------------------------- method `when` not found for this struct
...
LL |     Race::new(|race| race.when());
   |                           ^^^^ method cannot be called on `RaceBuilder<_, Never<_>>` due to unsatisfied trait bounds
   |
note: trait bound `Never<_>: StatefulFuture<Option<_>>` was not satisfied
  --> $DIR/issue-84073.rs:14:8
   |
LL | impl<T, F> RaceBuilder<T, F>
   |            -----------------
LL | where
LL |     F: StatefulFuture<Option<T>>,
   |        ^^^^^^^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound introduced here
note: the trait `StatefulFuture` must be implemented
  --> $DIR/issue-84073.rs:3:1
   |
LL | pub trait StatefulFuture<S> {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.